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The easiest mod that worked for several folks over the years is a nice shot of giggle-gas.

A 75 shot of Nitrous is about max healthy level on a stock setup.

Your tranny won't live long with ANY kind of serious boost in power. When I finished building SHO R T S (Eaton M90 @ 16psi boost) I already had a heavily built tranny and Tq Converter on a bench waiting to go in when the stock tranny failed. Stock tranny last 160 miles under boost.

Any kind of forced induction would be whatever you can make yourself. I have done both Centrifugal and Roots superchargers on the 3.4 SHO. Looked into a rear turbo, which on hindsight probably would have been the easiest fabrication. Not as much up-front ummph, but probably less of a shock on the drivetrain.

The 3.4L block uses the same diameter pistons (and rods) from the 2.5L Duratec. IIRC the SHO pistons are flat top whereas the Duratec pistons are dished. Since the rods are shared with the Duratec 2.5 and 3.0, I always thought it would be cool to bore and sleeve the 3.4L and use Duratec 3.0 pistons for a 4.0L SHO.

Here is my two cents worth. Officials of all three companies involved (Ford, Yamaha and Volvo) insist that the Volvo V8 is not related to the SHO engine.

The Volvo V8 is a die-cast, open-deck aluminum block and is different from the sand-cast closed-deck aluminum SHO engine block. The interesting feature is the two engines share many common dimensions including bore centers, stroke, bearing journal diameters, and deck height.